問題描述

我想用 Apache Commons Net 實現一個 FTP 客戶端，僅用于上傳數據.FTP 服務器的連接和登錄工作正常.但是上傳不正常.這些文件與原件相比有點大.并且文件已損壞.我嘗試了圖像、視頻和文本文件.只有文本文件沒問題.

I want to implement a FTP Client with Apache Commons Net only for uploading data. The Connection and Login to FTP-Server works fine. But the upload does not work right. The files are a little to big as the originals. And the files are damaged. I tried an image, a video and a textfile. Only the textfile is alright.

現在我在調試時看到了

boolean tmp=client.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);

給我 false.所以不能設置.為什么?(也許這不是問題?)

gives me false. So it can not be set. Why? (Maybe this is not the problem?)

這是我的其余代碼

client=new FTPClient();

    try {           
        int reply;
        client.connect(url, port);
        reply = client.getReplyCode();

        if (!FTPReply.isPositiveCompletion(reply))
        {
            client.disconnect();
            System.err.println("FTP server refused connection.");
            System.exit(1);
        }


        client.login(user, pw);
        boolean xxx=client.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);
        client.setControlKeepAliveTimeout(300);
        client.enterLocalPassiveMode();

if (client.isConnected())
    {
    try {
        File file=new File(<FILE>);
        FileInputStream inputStream = new FileInputStream(file);
        OutputStream outputStream = client.storeFileStream(file.getName());

          byte[] buffer = new byte[4096];
          int l;
       while((l = inputStream.read(buffer))!=-1)
               {
                outputStream.write(buffer, 0, l);
            }

          inputStream.close();
          outputStream.flush();
          outputStream.close();}

推薦答案

更改如下:

boolean xxx=client.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);

應該是:

boolean xxx=client.setFileType(FTP.BINARY_FILE_TYPE);

您將 FileTransferModes 與 FileTypes 混淆了.

You have confused FileTransferModes with FileTypes.

可用的文件類型有:

• FTP.ASCII_FILE_TYPE(默認)
• FTP.BINARY_FILE_TYPE
• FTP.EBCDIC_FILE_TYPE
• FTP.LOCAL_FILE_TYPE

可用的 FileTransferMode 有:

The available FileTransferModes are:

• FTP.STREAM_TRANSFER_MODE(默認)
• FTP.BLOCK_TRANSFER_MODE
• FTP.COMPRESSED_TRANSFER_MODE

我想如果 apache 為這些常量類型引入了枚舉，那么可以避免這種問題，但是該庫將無法用于 pre-java-5 運行時.
我想知道 java 1.4 兼容性到底有多大問題.

I suppose if apache introduced enums for these constant types, then this kind of problem could be avoided, but then the library would not be available to pre-java-5 runtimes.
I wonder how much of an issue java 1.4 compatibility really is.

這篇關于Apache Commons FTP 問題的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！